检索结果-南通市图书馆

Stabilization and Evaluation of Modified Nanofiber Flour Wood on the Properties of Cement-Baszd Mortar

在线全文

学校读者我要写书评

暂无评论

Journal of Renewable Materials 2019年第8期7卷 763-774页

作者： Fadhel Aloulou Sabrine Alila Habib Sammouda Laboratory of Energy and Materials(LabEM):LR11ES34 Higher School of Science and Technology of Hammam SousseUniversity of SousseSousseTunisia Laboratoire Sciences des Matériaux et Environnement:LMSE Facultédes Sciences de SfaxUniversity of SfaxSfaxTunisia

The influence of nanofiberwood on the properties of the fresh condition of cement based mortars is not known in detail,despite recent advances in nanocellulose technology and it is related composite *** wood from industrial waste,produced by high-pressure homogenization,was used as cement partial replacement for cement paste at a content ranging from 0%to 2%by weight of *** effect of the nanofiber wood content on the porosity,the compressive strength and the degree of hydration of the cement was *** have shown an improvement in the compressive strength by more than 50%with 1%of added fiber *** chemical modification of nanofibers wood by grafting of chains alkyls in their surfaces can reduce the quantity of water absorbed by the *** addition of an anionic additive(SDBS)in the water of mixing improves of more the surface of samples by minimizing the size of pores by emulsion effect,from where the absorption of water *** degree of hydration of the cement has increased with the cellulose content containing *** analyze revealed that the presence of nanofiber wood favored the hydration of the cement by producing more calcium silicate gel and portlandite,probably the main reason for this improvement in compressive strength.

关键词： Cement nano-fiber adjuvant surfactant emulsion hydratation thermal conductivity

SYNTHESIS OF POLYSTYRENE/TiO_2 CORE-SHELL MATERIALS

维普期刊数据库评论

在线全文

维普期刊数据库

学校读者我要写书评

暂无评论

Chinese Journal of Polymer Science 2009年第2期27卷 149-155页

作者：刘凤岐 College of Chemistry Jilin University

TiO_2-coated polystyrene nanoparticles were prepared in a simple ***,functional PS particles were synthesized by copolymerizing one kind of polymerizable surfactant with *** the stable dispersions of polystyrene nanoparticles were used as templates,and polystyrene nanoparticles were coated with titania by in situ hydrolysis of tetra-n- butyl titanate (TBT).No surface treatment and centrifugation/redispersion cycle process were needed during the whole *** PS spheres with unifor...

关键词： Polymeriable surfactant emulsion PS/TiO_2.

Crosslinking of viral nanoparticles with “clickable” fluorescent crosslinkers at the interface

在线全文

学校读者我要写书评

暂无评论

Science China Chemistry 2010年第6期53卷 1287-1293,1459页

作者： KAUR Gagandeep BARNHILL Hannah Department of Chemistry and Biochemistry and Nanocenter University of South Carolina

Cu (I) catalyzed alkyne-azide cycloaddition (CuAAC) reaction,a typical "click" reaction,is one of the modular synthetic approaches which has been broadly used in various organic syntheses,medicinal chemistry,materials development and bioconjugation *** have for the first time synthesized two dialkyne derivatized fluorescent crosslinkers which could be applied to crosslink two biomolecules using CuAAC *** yellow mosaic virus,a plant virus with unique structural and chemical properties,was used as a prototypical scaffold to form a 2D single layer at the interface of two immiscible liquids and crosslinked with these two linkers by the CuAAC *** crosslinking,the fluorescence of both linkers diminished,likely due to the distortion of the polymethylene backbone,which therefore could be used to indicate the completion of the reaction.

关键词： pickering emulsion crosslinking nanoparticles CuAAC reaction click chemistry interfacial assembly

Influence and Dispersion of Nanofiber of Wood Modified on Properties of Cement Based Mortars

在线全文

学校读者我要写书评

暂无评论

Journal of Renewable Materials 2019年第7期7卷 631-641页

作者： Fadhel Aloulou Alila Sabrine Habib Sammouda LabEM-LR11ES34:Laboratory of Energy and Materials University of SousseTunisia LMSE:Laboratoire Sciences des Matériaux et Environnement University of SfaxTunisia

Wood nanofibers from industrial waste have been used as polymeric material to reinforce the cement paste to a content of up to 2%by weight of *** effect of the wood nanofibre content on the porosity,the compressive strength and the degree of hydration of the cement was *** results showed an improvement in compressive strength of over 50%with 1%of added *** modification of nanofiber wood by grafting alkyl chains to their surface can reduce the amount of water absorbed by the *** of an anionic additive(SDBS)to the mixing water improves the surface of the samples more and more by minimizing the pore size by emulsion effect,hence the water absorption *** degree of hydration of the cement increased with the cellulose content containing *** analysis revealed that the presence of nanofibers favored the hydration of the cement by producing more calcium silicate gel and portlandite,probably the main reason for this improvement in compressive strength.

关键词： Cement nano-fiber wood modified adjuvant,surfactant emulsion

维普期刊数据库评论

在线全文

维普期刊数据库

学校读者我要写书评

暂无评论

液膜处理过程中粘度的变化

膜科学与技术 1994年第3期14卷 41-46页

作者：曾平王玉鑫湘潭大学化学系湘潭大学化学系湘潭 411105 湘潭 411105

研究了影响多重乳状液粘度的一些因素,如表面活性剂、添加剂、油内比、搅拌速度、内相试剂及其浓度、温度等。并对多重乳状液的粘度和溶胀规律作了考察,发现乳状液的粘度与液膜的稳定性和溶胀密切相关。

关键词： emulsion viscosity surfactant swelling

Study on the hardening mechanism of cement asphalt binder

在线全文

学校读者我要写书评

暂无评论

Science China(Technological Sciences) 2010年第5期53卷 1406-1412页

作者： YANG JinBo,YAN PeiYu,KONG XiangMing & LI Xiang Key Laboratory of Structural Engineering and Vibration of Education Ministry of China,Department of Civil Engineering,Tsinghua University,Beijing 100084,China Key Laboratory of Structural Engineering and Vibration of Education Ministry of China Department of Civil Engineering Tsinghua University

The hydration and hardening mechanism of cement asphalt binder(CAB) was *** early hydration process,hydration products and paste microstructure of CAB made by Portland cement and anionic asphalt emulsion were investigated by calorimetry,X-ray diffraction,and environmental scanning electron *** early hydration process of CAB can be characterized as 5 stages similar to those of Portland *** is no chemical reaction detected between cement and asphalt,hence no new hydration products other than those of Portland cement are *** hardening of CAB begins with the hydration of *** the hydration of cement comes into the acceleration period and its exothermic rate comes to the maximum,the coalescence of asphalt particles in asphalt emulsion is *** the hardened system of CAB,it was found that the hydration products of cement form the skeleton and are covered by the continuous asphalt *** formed an interpenetrating network *** emulsifiers in the asphalt emulsion may retard the hydration process of cement.

关键词： cement asphalt binder asphalt emulsion Portland cement hydration coalescence

Engineered Hybrid Materials with Smart Surfaces for Effective Mitigation of Petroleum-Originated Pollutants

在线全文

学校读者我要写书评

暂无评论

Engineering 2021年第10期7卷 1492-1503页

作者： Nisar Ali Muhammad Bilal Adnan Khan Farman Ali Mohamad Nasir Mohamad Ibrahim Xiaoyan Gao Shizhong Zhang Kun Hong Hafiz MNIqbal Key Laboratory for Palygorskite Science and Applied Technology of Jiangsu Province National and Local Joint Engineering Research Center for Deep Utilization Technology of Rock-salt ResourceFaculty of Chemical EngineeringHuaiyin Institute of TechnologyHuaian 223003China School of Life Science and Food Engineering Huaiyin Institute of TechnologyHuaian 223003China Institute of Chemical Sciences University of PeshawarPeshawar 25120Pakistan Department of Chemistry Hazara UniversityMansehra 21300Pakistan School of Engineering and Sciences School of Chemical SciencesUniversiti Sains MalaysiaPenang 11800Malaysia School of Engineering and Sciences Tecnologico de MonterreyMonterrey 64849Mexico

The generation and controlled or uncontrolled release of hydrocarbon-contaminated industrial wastewater effluents to water matrices are a major environmental *** contaminated water comes to surface in the form of stable emulsions,which sometimes require different techniques to mitigate or separate *** the crude emulsions and hydrocarbon-contaminated wastewater effluents contain suspended solids,oil/grease,organic matter,toxic elements,salts,and recalcitrant *** treatment of crude oil emulsions has been one of the most important challenges due to the complex nature and the substantial amount of generated ***,the recovery of oil from waste will help meet the increasing demand for oil and its *** this context,functional nanostructured materials with smart surfaces and switchable wettability properties have gained increasing attention because of their excellent performance in the separation of oil–water *** improvements in the design,composition,morphology,and fine-tuning of polymeric nanostructured materials have resulted in enhanced demulsification ***,we reviewed the environmental impacts of crude oil emulsions and hydrocarbon-contaminated wastewater *** effective treatments by smart polymeric nanostructured materials with wettability properties have been stated with suitable *** fundamental mechanisms underpinning the efficient separation of oil–water emulsions are discussed with suitable examples along with the future perspectives of smart materials.

关键词： emulsion Hydrocarbon-contamination Environment impacts Hybrid nanomaterials Oil-water separation Wastewater treatment

Upstream Operations in the Oil Industry： Rigorous Modeling ofan Electrostatic Coalescer

在线全文

学校读者我要写书评

暂无评论

Engineering 2017年第2期3卷 220-231页

作者： Francesco Rossi Simone Colombo Sauro Pierucci Eliseo Ranzi Flavio Manenti Department of Chemistry Materials and Chemical Engineering "Giulio Natta" Polytechnic University of Milan Milan 20133 Italy Davidson School of Chemical Engineering Purdue University West Lafayette IN 47907-2100 USA

This paper deals with a first-principle mathematical model that describes the electrostatic coalescer unitsdevoted to the separation of water from oil in water-in-oil emulsions, which are typical of the upstreamoperations in oil fields. The main phenomena governing the behavior of the electrostatic coalescer are denscribed, starting from fundamental laws. In addition, the gradual coalescence of the emulsion droplets isconsidered in the mathematical modeling in a dynamic fashion, as the phenomenon is identified as a keystep in the overall yield of the unit operation. The resulting differential system with boundary conditionsis then integrated via performing numerical libraries, and the simulation results confirm the available lit-erature and the industrial data. A sensitivity analysis is provided with respect to the main parameters. Themathematical model results in a flexible tool that is useful for the purposes of design, unit behavior predic-tion. performance rnoniroring, and ontimization.

关键词： Upstream operations Electrostatic coalescer Desalter Rigorous modeling Water-oil emulsion

Effects of the chemical structure of surfactants on the stability of naphthenic oil-based metalworking fluids

在线全文

学校读者我要写书评

暂无评论

Chinese Chemical Letters 2020年第2期31卷 345-348页

作者： Yuan Xue Jinbao Liu Maiying Xie Fengfei Chen Mingan Zhou Hualin Lin Fan Zhang Shizhou Liu Zhiqiao Wu Sheng Han School of Chemical and Environmental Engineering Shanghai Institute of TechnologyShanghai 201418China Department of Science and Technology Shanghai Urban Construction Vocational CollegeShanghai 201415China College of Chemistry and Chemical Engineering Shanxi Datong UniversityDatong 037009China

In this study,various nonionic surfactants(NS) with different ethylene oxide(EO) numbers and tail lengths and its binary blends with anionic surfactants(AS) were used as emulsifiers for naphthenic oil to form the microemulsion metalworking fluids(MWFs),and the effects of them on the stability of the emulsion system were investigated by formulation triangle *** results indicated that binary complex surfactants of NS and AS as emulsifiers exhibited better emulsifying effect than that of single *** with different EO numbers and tail lengths presented various emulsifying ***(EO=10)exhibited the greatest number of stable formulations,especially the TX-10,but no linear relationship existed between the number of stable formulations and the tail length of *** addition,aromatic primary alcohol ethoxy late(APAE) series surfactants containing benzene groups similar to the cycloalkanes in the naphthenic oil so that presented the best emulsifying affect and the greatest number of stable *** co-surfactant of sodium dodecyl benzene sulfonate(SDBS) binary blends with NS exerted the best synergistic effect,and the stable formulations numbers were ranged from 5 to 7,next sodium stearate(SS) comes last followed by sodium dodecyl sulfate(SDS-1) and sodium dodecyl sulfonate(SDS-2).

关键词： Metal working fluid emulsion stability Emulsifying effects Stable formulations Naphthenic oil